Home / 458,631.20-687,716.40-209,031.20

Finding the Fourth Proportional to 458,631.20, 687,716.40 and 209,031.20

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Solution

The fourth proportional to 458,631.20, 687,716.40 and 209,031.20 is: 313,441.79

Step by Step Solution

  1. Step 1: Write the proportion equation
    458,631.20 : 687,716.40 = 209,031.20 : x
  2. Step 2: Convert to fraction form
    458,631.20/687,716.40 = 209,031.20/x
  3. Step 3: Cross multiply
    458,631.20x = 687,716.40 × 209,031.20
  4. Step 4: Simplify right side
    458,631.20x = 143,754,184,351.68
  5. Step 5: Solve for x
    x = 143,754,184,351.68/458,631.20
  6. Step 6: Final answer
    x = 313,441.79

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.